I used an Apple Card for my ICloud acct. but it didn’t work. Did I do the right thing?

Here is How to use Apple Card

Learn how to change the payment methods you use with Apple ID.

• Update a payment method: Tap the payment method that you want to change, then edit your information. Make sure that your information matches what's on file with your financial institution. You might need to enter the security code that's printed on your credit or debit card. If you see Apple Pay after the last 4 digits of the card number, edit your billing information in the Wallet app.
• Add a payment method: Tap Add Payment Method. You might see a suggestion to add a card that you use with Apple Pay. (If you add a new credit or debit card, you might see an option to add the new card to Apple Pay.)

Remove or reorder

• Remove a payment method: Tap Edit, then tap the Remove icon  or swipe left and tap delete.
• Change the order of your payment methods: Tap Edit, then use the Move Order icon  to rearrange your payment methods. Apple will attempt to charge payment methods in order from top to bottom. You can't change the order in which Apple ID balance is charged.